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Placental fusion

Dr Yuranga Weerakkody and Radswiki et al.

Placental fusion is a phenomenon that can occur in a twin pregnancy. This can occur to varying degrees. Determination of chorionicity on ultrasound can sometimes be difficult if there has been a placental fusion. 

In a DCDA pregnancy, there are no vascular anastomoses between the twin placentae and with an equator marking a zone of disc fusion where there is a narrow band at the equator where chorionic vessels do not cross 4

In a MCDA pregnancy, multiple vascular anastomoses are usually present making the junction less distinct with examples of arterial to venous, arterial to arterial, or venous to venous connections being evident 4.

Article information

rID: 15450
Synonyms or Alternate Spellings:
  • Fusion of placenta
  • Fusion of placentas

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